Malicious PDF — malware analysis report

Static analysis result for SHA-256 5886fba5f842adcc…

MALICIOUS

PDF

71.6 KB Created: 2020-12-27 09:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f1706593ab09bbbd8ba3dda0bdee0d9 SHA-1: 1d49eecf2b91c0a62059f24ecea9b524d7977970 SHA-256: 5886fba5f842adcc03d0bb69db4e607ccbacf987e37c9b7088fe7ba2e8379bc8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it's a phishing trojan. An external URI pointing to 'traffnew.ru' was extracted, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date sheet, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffnew.ru/aws?utm_term=ba+date+sheet+2019+du
    • https://cdn.sqhk.co/siwemawatu/egeifp4/marshmello_dab_wallpaper_4k.pdf
    • https://cdn-cms.f-static.net/uploads/4375080/normal_5f91e37e22cfc.pdf
    • https://static.s123-cdn-static.com/uploads/4403274/normal_5fe25201c6a55.pdf
    • https://cdn-cms.f-static.net/uploads/4475194/normal_5fad6fd5b773d.pdf
    • https://cdn-cms.f-static.net/uploads/4423750/normal_5fa5fd1850ef7.pdf
    • https://cdn-cms.f-static.net/uploads/4479673/normal_5fbe5381aefdc.pdf
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5fdbcc2fb8a4b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wewuxuviwar/restaurant_guide_michelin_haut_rhin.pdf
    • https://s3.amazonaws.com/woberiz/wujenoxevewasawasuvirugok.pdf
    • https://s3.amazonaws.com/bopuxosavubare/39189098033.pdf
    • https://s3.amazonaws.com/wutogugej/34252052069.pdf
    • https://s3.amazonaws.com/varoximu/st_albans_vt_holy_angels_cemetery.pdf
    • https://s3.amazonaws.com/henghuili-files2/vuzurebevelanonul.pdf
    • https://s3.amazonaws.com/jofunozuzof/vapakupoluluxizivevitas.pdf
    • https://uploads.strikinglycdn.com/files/1f83feb4-b884-4d74-8449-a12062c14248/potential_and_kinetic_energy_worksheet_grade_7.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc8c.bin
c23a625d273945720e907a652362fb970c1d93bde30e4160e638d1d82ad82311		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 5316 bytes
font_01_sfnt_off0000ee9f.bin
06f5203ac44392bfbd322ddcec58ca33b376f82e72dd1b566abaf26f10a672e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 10244 bytes

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